Steam-engine valve



P. W. GORDON. Steam Engine Valve.

No. 233,233. Patented Oct. 12,1880.

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UNITED STATES PATENT EEICE.

FREDERICK W. GORDON, OF IRONTON, OHIO.

STEAM-ENGINE VALVE.

SPECIFICATION forming part of Letters Patent No. 233,233, dated October 12, 1880.

Application filed June 17, 1879.

To all whom it may concern:

Be it known that I, FREDERICK W. Gon- DON, of Ironton, Lawrence county, Ohio, have invented certain new and useful Improvements in Reversing-Valves for Steam Engines, of which the following is a specification.

My invention relates to that class of valves which, while acting as the main induction and eduction valve of an engine, may be adjusted so as to cause the engine to move in either direction.

The object of my invention is to produce a steam-engine valve which may be driven by a single eccentric, and which may, without the aid of any complicated or shifting ports in the cylinder, by a simple shifting motion be caused to act as the main valve while the engine is running either way.

My invention consists of a double faced piston slide-valve having the ordinary features of common slide-valves upon one face and a pair of channel-pockets upon the other face, the said channels acting to convey both the live steam and the exhaust-steam, in combination with a cylindrical valve-seat having, in addition to the ordinary features of slide-valve seats, a pair of admission controlling-edges outside the main ports.

In the accompanying drawings, Figure 1 is a longitudinal section of my improved valve within its steam-chest; Fig. 2, a portional section of the same showing valve reversed, and Fig. 3 a part plan of the same.

A is the cylindrical steam-chest, having the usual steam-ports G O and exhaust-port D. Steam is admitted to steam chest as usual, and in such a manner as to find its way to both ends of the chest, either through double ports or through one port in combination with a hollow valve. In addition to the usual ports and bridges, ledges F F are left outside the main ports or are developed by recesses L L in the seat.

The valve B is a piston-valve, and upon one side of it are arranged two transverse ribs, H, and an exhaust-pocket, O. This face is thus seen to be a simple slide-valve face upon a cylindrical valve, and in Fig. 1 is shown in working relation with the seat. The

ends of the valve project beyond the ribs H, referred to. In fact, the valve is a long piston having a common short valve-face upon one side. The width of the ports and of the exhaust-pocket 0 should be less than one-quarter the circumference of the valve, for reasons which will yet be mentioned.

Upon the side of the valve opposite the face described is arranged another face, which bears a different relation to the valve-seat, as shown in Fig. 2. This valve-face has a cen tral transverse rib, K, which closes the exhaust-port in the seat, and has two end ribs, I, which project over the ledges F upon the seat, and whose inner edges match the outer edges of the seat'ledges. There are two pockets, N in this valve-face. steam and exhaust.

In the face first described, or common face, steam is admitted by uncovering steam-ports, and steam is exhausted by uncovering steamports also. In the other face steam is admitted by opening passages to the pockets, and exhausted by uncovering the exhaustport.

It will be seen that if the valve, as shown in Fig. 1, be pushed upward, steam will enter the lower port and exhaust from the upper one, while in Fig. 2, if the valve be moved upward, steam will enter the upper port and exhaust from the lower one. If this valve be actuated by an eccentric placed at right angles to the crank, the engine will run in one direction when one valve-face is at the seat, and in the opposite direction when the otheris engaged.

It is obvious that the eccentric can have no lead, and that the valve can have no lap. Where these conditions are satisfactory, it will be seen that the engine may be reversed by simply rotating the valve half round.

As each face of the valve occupies less than a quarter of the circumference, the blanks between them will close the ports before bringing a new face into action.

Any lever attached to the valve-stem may be used to rotate the valve and reverse the engine, or it may have its rotating motion converted and transmitted through gearing or other mechanism. In the case of double en- 7 These pockets serve for gines the two valve-stems maybe so geared or lindrical valve-seat having three ports, two coupled that a sin glelever rotates them simnlbridges, and two marginal ledges, arranged IO taneously. and operating substantially as set forth.

I claim as my invention- Areciprocatingpiston-valvehavingapoeket FRED GORDON and two transverse ribs on one side, and two Witnesses: pockets and three transverse ribs on the op- I). \V. VOGLESONG, posite side, combined with a stationary ey- JOHN CAMPBELL.

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